Geodesic
A boundary value problem of periodic type for a second-order nonlinear ordinary differential equation
Differencialʹnye uravneniâ, Tome 22 (1986) no. 9, pp. 1551-1556 
B. L. Shekhter. A boundary value problem of periodic type for a second-order nonlinear ordinary differential equation. Differencialʹnye uravneniâ, Tome 22 (1986) no. 9, pp. 1551-1556. http://geodesic.mathdoc.fr/item/DE_1986_22_9_a9/
@article{DE_1986_22_9_a9,
     author = {B. L. Shekhter},
     title = {A boundary value problem of periodic type for a second-order nonlinear ordinary differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1551--1556},
     year = {1986},
     volume = {22},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_9_a9/}
}
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